Copolyesters from 4,4&#39;-biphenyldicarboxylic acid, 1,6-hexanediol and 1,4-butanediol

ABSTRACT

Disclosed are copolyesters comprising an acid component of 4,4&#39;-biphenyldicarboxylic acid and a glycol component comprising 1,6-hexanediol and 1,4-butanediol. The copolyesters exhibit unusually high tensile strengths.

FIELD OF THE INVENTION

The present invention concerns copolyesters from 4,4'-biphenyldicarboxylic acid, 1,6-hexanediol and 1,4-butanediol that have unusually high tensile strengths.

BACKGROUND OF THE INVENTION

Homopolyesters of 4,4'-biphenyldicarboxylic acid and certain aliphatic glycols are disclosed in the literature. Homopolyesters of 4,4'-biphenyldicarboxylic acid and ethylene glycol, 1,4-butanediol, and 1,6-hexanedial are disclosed by Meurisse et al., in the British Polymer Journal, Volume 13, page 57 (1981) (Table 1). Jackson and Morris included a review of homopolyesters from 4,4'-biphenyldicarboxylic acid and various aliphatic glycols in the Journal of Applied Polymer Science, Applied Polymer Symposia, 41, 307-326 (1985). Krigbaum et al. disclose relatively low molecular weight homopolyesters from 4,4'-biphenyldicarboxylic acid and various aliphatic glycols in the Journal of Applied Polymer Science, Polymer Letters Edition, 20, 109-115 (1982). Low molecular weight homopolyesters of 4,4'-biphenyldicarboxylic acid are also disclosed by Wanatabe et al., Macromolecules, 21(1), p. 278-280 (1988), and Krigbaum et al., Polymer, 24(10), p. 1299-1307 (1983). Jpn. Kokai Tokkyo Koho JP 61,236,821 [86,236,821] (1986) also discloses low molecular weight polyesters from 4,4'-biphenyldicarboxylic acid and 1,4-butanediol prepared below their melting temperatures in a nonvolatile liquid. Polyesters of 1,6-hexanediol and 4,4-biphenyldicarboxylic acid are disclosed in Kobunshi Ronbunshu, Vol. 44(12), 983-986 (December 1987) having limiting viscosity number of about 0.31.

U.S. Pat. No. 3,842,040 and U.S. Pat. No.3,842,041 disclose the homopolyester of 4,4'-biphenyldicarboxylic acid and ethylene glycol.

Copolyesters of 4,4'-biphenyldicarboxylic acid (BDA) and certain aliphatic glycols are discloed and ethylene glycol (EG), 1,4-butanediol (BD), 1,6-hexanediol (HD) are specifically disclosed in column 2, line 70 of U.S. Pat. No.2,976,266 in a general listing along with other aliphatic glycols useful in this disclosed invention. However, the copolyester of BDA, BD, and HD is not specifically disclosed.

German Offenlegungsschrift, DE 1935252, discloses polyesters of two aromatic dicarboxylic acids which include 10 to 50 mol % 4,4-biphenyldicarboxylic acid, 50 to 90 mol % of terephthalic acid and the two glycols ethylene glycol and 1,4-cyclohexanedimethanol.

Japanese patent, Kokai Tokkyo Koho JP 57/198726 discloses copolyesters containing 25-80 mol % 4,4'-biphenyldicarboxylic acid with various aliphatic glycols and aromatic dicarboxylic acids.

U.S. Pat. No.4,742,151 discloses ultra-high-molecular weight polyesters prepared from aromatic dicarboxylic acids and alkylene glycols containing from 2 to 6 carbons having an intrinsic viscosity greater than 1.5. 4,4'-Biphenyldicarboxylic acid is disclosed in a list of dicarboxylic acids useful to the disclosed invention.

Heretofore, copolyesters from 4,4'-biphenyldicarboxylic acid, 1,6-hexanediol, and 1,4-butanediol have been unknown.

SUMMARY OF THE INVENTION

The present invention is directed to a copolyester comprising

(A) an acid component comprising repeating units of at least 80 mol % 4,4'-biphenyldicarboxylic acid, and

(B) a glycol component comprising repeating units of from about 95-10 mol % 1,6-hexanediol, and about 5-90 mol % 1,4-butanediol,

wherein the total mol % of acid component and glycol component are each 100 mol %.

The present invention is also directed to a composition comprising:

(i) about 30 to 99 weight percent of the copolyester of the invention, and

(ii) about 1 to 70 weight percent of at least one property modifier.

DETAILED DESCRIPTION OF THE INVENTION

The prior art describes molding, spinning, and film extrusion as viable processes for shaping the polyesters based on 4,4'-biphenyldicarboxylic acid. We have discovered a range of polyester compositions within this broad disclosure based on 4,4'-biphenyldicarboxylic acid, 1,6-hexanediol hexanediol, and 1,4-butanediol having exceptionally high tensile strength.

Injection-molded bars comprising at least 80 mol % 4,4'-biphenyldicarboxylic acid units, 10 to 95 mol % 1,6-hexanediol units, and 90 to 5 mol % 1,4-butanediol units have unexpectedly high tensile strength and typically have an inherent viscosity of at least about 0.6, or preferably about 0.8, or more. The homopolyester of 1,4-butanediol has a tensile strength of 8,500 psi. The homopolyester of 1,6-hexanediol (HD) with BDA has a tensile strength of 11,000 psi. Modification of either homopolyester with as little as 10 mol % of the coglycol nearly doubles tensile strength at low HD content and the copolyesters containing low 1,4-butanediol content also have substantially increased tensile strength.

In addition to excellent tensile strengths, the polyesters of our invention also have excellent solvent resistance. Molded bars are substantially unaffected after exposure for 24 hours in a variety of solvents which include toluene, 1,2-dichloroethane, methyl isobutyl ketone, ethyl acetate, ethanol, water, sulfuric acid, 10% sodium hydroxide, gasoline, acetone, acetic acid, 5% Clorox bleach, 50/50 water/ethanol, benzyl alcohol, nitric acid and methylene chloride.

The copolyesters of this invention are prepared from 4,4-biphenyldicarboxylic acid and/or its esters, 1,6-hexanediol, and 1,4-butanediol. Examples of useful aromatic esters are the dimethyl, diethyl, dibutyl, and diphenyl esters or any combination of mixed esters. The polyesters may be prepared from glycol esters of BDA. The polyesters may be prepared in the melt or in the solid phase or by a combination of these processes. In preferred copolyesters of the present invention the acid component is about 100 mol % of 4,4'-biphenyldicarboxylic acid.

It is also preferred that the glycol component is about 70-30 mol % 1,6-hexanediol and about 30-70 mol % 1,4-butanediol.

The acid portion of the polyesters of the present invention (component (A)) may be substituted with less than about 20 mol %, but preferably, less than about 10 mol % of other aromatic dicarboxylic acids having up to 20 carbon atoms. Examples of suitable aromatic dicarboxylic acids include terephthalic, isophthalic, 1,5-, 2,6-, 2,7-naphthalenedicarboxylic, or trans-4,4'-stilbenedicarboxylic acids.

Likewise, the glycol portion of the polyesters (component (B)) may be substituted with less than about 10 mol % of other aliphatic glycols having 2 to 20 carbon atoms so long as the high tensile strength remains substantially unaffected. Examples of useful glycols are 1,2-propanediol, 1,3-propanediol, 1,4-butanediol, 1,5-pentanediol, 1,6-hexanediol, and p-xylene glycol.

The copolyesters of the present invention preferably have tensile strengths of greater than 12,000 psi, more preferably greater than 15,000 psi.

In the composition of the present invention it is preferred that component (i) is present in an amount of about 50 to about 95 weight percent, and component (ii) is present in an amount of about 5 to about 50 weight percent.

In the composition of the present invention it is preferred that component (ii) is a property modifier selected from polyamides such as nylon 6,6 from Du Pont, poly(ether-imides) such as Ultem poly(ether-imide) from General Electric, polyphenylene oxides such as poly(2,6-dimethylphenylene oxide) or poly(phenylene oxide)/polystyrene blends such as the Noryl resins from General Electric, polyesters, polyphenylene sulfides, polyphenylene sulfide/sulfones, poly(ester-carbonates), polycarbonates such as Lexan polycarbonates from General Electric, polysulfones, polysulfone ethers, and poly(ether-ketones) of aromatic dihydroxy compounds. The aromatic dihydroxy compounds used to prepare these polymers are disclosed in, for example, U.S. Pat. Nos. 3,030,335 and 3,317,466.

Component (ii) of the composition of this invention may also be conventional flame retardants such as a phosphorus compound, a halogen compound, or a halogen compound in combination with an antimony compound, or fillers such as talc or mica, or reinforcing agents such as glass fiber, Kevlar (poly(1,4-phenylene terephthalamide)), or carbon fiber.

It is preferred that the copolyester and/or composition of the present invention is in the form of a fiber, a film, a container, or a molded object.

The following examples are to illustrate the invention but should not be interpreted as a limitation thereon.

Inherent viscosities (I.V) are determined at 25° C. in 25/35/40 (wt./wt./wt.) pnenol/teterachloroethane/p-chlorophenol at a concentration of 0.1 gram (g)/100 milliliters (mL). The melting points of the copolyesters are determined using a Perkin-Elmer DSC 2B Differential Scanning Calorimeter at a scan rate of 20° C./minute. Compositions are determined using proton nuclear magnetic resonance spectroscopy (NMR).

The polyesters are ground to pass a 3-millimeter (mm) screen, dried at 100° C. in a vacuum oven for 24 hours, and injection molded on a 1-ounce (oz) Watson-Stillman molding machine to give 1/16-inch (in.) thick D1822 Type L tensile bars. The tensile strength is determined following the procedure of ASTM D638.

EXAMPLE 1

This example illustrates the preparation of the copolyester consisting of 100 mol % 4,4'-biphenyldicarboxylic acid units, and 73 mol % 1,6-hexanediol units, and 27 mol % 1,4-butanediol units.

A mixture of 202.5 g (0.75 mol) dimethyl 4,4'-biphenyldicarboxylate, 85.0 g (0.72 mol) 1,6-hexanediol, 27.0 g (0.30 mol) 1,4-butanediol, and 0.14 g titanium tetraisopripoxide is placed in a 1-liter flask equipped with an inlet for nitrogen, a metal stirrer, and a short distillation column. The flask is heated at 200° C. for about 3 hours, at 240° C. for about 0.25 hour, and finally at 260° C. for about 0.5 hour. A vacuum of 0.5 mm is gradually applied over the next 5 minutes as the temperature is raised to 270° C. Full vacuum is maintained for about 10 minutes. A high melt viscosity, white crystalline polymer is obtained with an I.V. of 1.22 and a melting point of 175° C.

The polymer is injection molded at 220° C. to give tensile bars with 13,800 pounds per square inch (psi) tensile strength.

The other examples in Table 1 are prepared and injection molded in a similar manner. The copolyesters of Table 1 have an acid component of 100 mol % BDA.

                  TABLE 1                                                          ______________________________________                                         Effect of Composition on the Tensile Strength of                               4,4'-Biphenyldicarboxylic Acid/1,6-Hexanediol/-                                1,4-Butanediol Copolyesters                                                                  DSC,    Molding          Tensile                                 HD,   BD      Tm,     Temp., Molding I.V.,                                                                            Strength,                               Mol % Mol %   °C..sup.a                                                                       °C..sup.b                                                                      Before                                                                               After psi                                   ______________________________________                                         100.sup.c                                                                            0       217     210    1.14  1.11  10000                                 100.sup.c                                                                            0       217     240    1.14  1.04  11300                                 95    5       210     210    1.19  1.19  19100                                 92    8       197     240    1.13  1.01  11800                                 90    10      202     210    1.23  1.22  21600                                 73    27      175     220    1.22  1.27  13800                                 75    25      176     240    1.36  1.25  12000                                 53    47      176     250    1.57  1.47  14400                                 52    48      179     240    1.65  1.53  18400                                 32    68      236     260    1.25  1.17  16700                                 26    74      250     240    1.40  1.23  17000                                 12    88      276     300    1.80  --     9800                                 9     91      282     260    1.65  0.92  16100                                 0     100     295     280    1.14  0.80   6300                                 ______________________________________                                          .sup.a Melting Point in °C. as determined by Differential Scanning      Calorimetry.                                                                   .sup.b The molding temperature is the set temperature of the last two          zones of the Boy 22S molding machine. The actual melt temperatures are         about 20-30° C. above the indicated molding temperatures.               .sup.c The I.V. of this polymer is equivalent to that prepared by Meuriss      in the Brit. Poly. J., Vol. 13, p. 57 (1981).                            

The invention has been described in detail with particular reference to preferred embodiments thereof, but it will be understood that variations and modifications can be effected within the spirit and scope of the invention. 

We claim:
 1. A copolyester comprising(A) an acid component comprising repeating units of at least 80 mol % 4,4'-biphenyldicarboxylic acid, and (B) a glycol component comprising repeating units of from about 95-10 mol % 1,6-hexanediol, and about 5-90 mol % 1,4-butanediol,wherein the total mol % of acid component and glycol component are each 100 mol %.
 2. The copolyester of claim 1 wherein the acid component is about 100 mol % of 4,4'-biphenyldicarboxylic acid.
 3. The copolyester of claim 1 wherein the glycol component is about 70-30 mol % 1,6-hexanediol and about 30-70 mol % 1,4-butanediol.
 4. The copolyester of claim 2 wherein the glycol component is about 50 mol % 1,6-hexanediol and about 50 mol % 1,4-butanediol.
 5. The copolyester of claim 1 having an inherent viscosity of at least about 0.6 determined at 25° C. in 25/35/40 (wt./wt./wt.) phenol/tetrachloroethane/p-chlorophenol at a concentration of 0.1 g./100 ml.
 6. The copolyester of claim 1 having an inherent viscosity of at least about 0.8 determined at 25° C. in 25/35/40 (wt./wt./wt.) phenol/tetrachloroethane/p-chlorophenol at a concentration of 0.1 g./100 ml.
 7. The copolyester of claim 1 wherein the acid component comprises at least about 90 mol % 4,4'-biphenyldicarboxylic acid and less than about 10 mol % of at least one other aromatic dicarboxylic acid having 8 to 20 carbon atoms; and the glycol component comprises less than about 10 mol % of at least one other aliphatic glycol having 2 to 20 carbon atoms.
 8. The copolyester of claim 7 wherein said other dicarboxylic acid is terephtahalic acid, isophthalic acid, 1,5-naphthalenedicarboxylic acid, 2,6-napththalenedicarboxylic acid, 2,7-napthalenedicarboxylic acid, or trans-4,4'-stilbenedicarboxylic acid; said other aliphatic glycol is 1,2-propanediol, 1,3-propanediol, 1,5-pentanediol, or p-xylene glycol.
 9. The copolyester of claim 1 having a tensile strength of greater than 12,00 psi.
 10. The copolyester of claim 1 having a tensile strength at greater than about 15,000 psi.
 11. A fiber comprising the copolyester of claim 1,
 12. The fiber of claim 15 wherein the copolyester is the copolyester of claim
 2. 13. A film comprising the coplyester of claim
 1. 14. The film of claim 13 wherein the copolyester is the copolyester of claim
 2. 15. A molded object comprising the coplyester of claim
 1. 16. The molded object of claim 15 wherein the copolyester is the copolyester of claim 2,
 17. A container comprising the copolyester of claim
 1. 18. The container of claim 17 wherein the copolyester is the copolyester of claim
 2. 19. The copolyester of claim 1 wherein the glycol component is about 90 mol % 1,6-hexanediol and about 10 mol % 1,4-butanediol. 